Clive Staples Lewis (November 29, 1898 – November 22, 1963)
There is no reason to suppose that self-consciousness, the recognition of a creature by itself as a “self,” can exist except in contrast with an “other,” a something which is not the self. . . . The freedom of a creature must mean freedom to choose: and choice implies the existence of things to choose between. A creature with no environment would have no choices to make: so that freedom, like self-consciousness (if they are not, indeed, the same thing), again demands the presence to the self of something other than the self.